should i go back to stock to save gas
Thread Starter
Rookie
Joined: Jun 2010
Posts: 78
Likes: 0
From: pa
should i go back to stock to save gas
I need help. I don’t know Crap about engine performance mods. I have a IS300 I got couple months back. Bought it in spur of the moment deal without knowin much about it but I thought it was so sexy . From what I know now I would not of got it because the poor gas mileage I think caused from the the aftermarket mods specifically the cold air intake, the exhaust and I think its chipped too.
Someone told me there mods should improve gas mileage while someone else said the chip is programmed to throw more gas into engine decreasing mileage. Im thinkin those mods are hard on the engine that decrease the life of the engine and kill the gas mileage.
I get around 15 city and 17-19 highway and I only drive 60 on the highway. Everytime I drive over 60 I can feel the exhaust getting louder and the gas getting eatin up more . I was wondering what my options were to help my gas mileage and prolong the life of the engine. Should I take out all 3 or can I just replace one or two to help my gas mileage. Any advice or recommedations where I can take my ride for this type of work for cheap but good work. also considering replacing the cold air intake and exhaust back to stock.
Tank chu
Someone told me there mods should improve gas mileage while someone else said the chip is programmed to throw more gas into engine decreasing mileage. Im thinkin those mods are hard on the engine that decrease the life of the engine and kill the gas mileage.
I get around 15 city and 17-19 highway and I only drive 60 on the highway. Everytime I drive over 60 I can feel the exhaust getting louder and the gas getting eatin up more . I was wondering what my options were to help my gas mileage and prolong the life of the engine. Should I take out all 3 or can I just replace one or two to help my gas mileage. Any advice or recommedations where I can take my ride for this type of work for cheap but good work. also considering replacing the cold air intake and exhaust back to stock.
Tank chu
THe car is rated at 16 city and 21 hwy so it sounds about right. Made sure you do a tune up if it hasn't been done already, check your air pressure like stated and you should get a couple more mpg.
Thread Starter
Rookie
Joined: Jun 2010
Posts: 78
Likes: 0
From: pa
thanks for the replies. What is the average rpms at 65. Mine goes over 3000rpms at that speed. is that due to the exhaust. i heard the avg at 65 hovers around 2600-2900 for that speed.
Last edited by LexiSoSexi; Jan 29, 2011 at 04:53 PM.
Trending Topics
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Lexus NX 350h: A Fuel-Sipping Secret Hot Hatch???
Michael S. Palmer
5 Best & 5 Worst Lexus Daily Drivers
Joe Kucinski
Top 5 Hottest Lexus & Toyotas in 2026 (Hardest To Buy)
Brett Foote
2026 Lexus IS 350 F Sport Review: The Last of Its Kind Still Rocks
Michael S. Palmer
Top 10 Most Confusing Things Lexus Has Ever Done!
Joe Kucinski
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles
Michael S. Palmer
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4
Joe Kucinski
8 Weirdest Things Lexus Has Ever Built
Verdad Gallardo
10 Lexus Designs That Have Aged Like Fine Wine
Verdad Gallardo
No, just depends on how the owner treats the car.
On top of keeping your tires properly inflated...make sure you are caught up on your fluids....
tranny
differential
engine oil
coolant
Keep your air filter clean and try Seafoam to clean out the carbon build.
I have aftermarket intake, headers, ypipe and exhaust.....my mpg has not decreased. I avg 360 per tank.
You never seen this before??? lol
Thread Starter
Rookie
Joined: Jun 2010
Posts: 78
Likes: 0
From: pa
Thanks guys. i keep up with maintanance. whatever is required at that mileage interval. i did the very expensive timing belt and pump at 90k. i do the regularly required oil changes. Have not done the air pressure yet for the tires on my 19s also alignment is off from a tow i had from a previous snowstorm. ill get my tire pressure checked , tires balanced and alignment this week hopefully my car will be smoother.
Thread Starter
Rookie
Joined: Jun 2010
Posts: 78
Likes: 0
From: pa
Sway is ur car chipped? Is a chip required to properly run these after market parts such as intake and exhuast? Im lookin to get my chip removed but i wondering if it will affect the performance of my air intake and exhuast. From what i heard the chip makes the engine work harder and throws more gas into it.
Thread
Thread Starter
Forum
Replies
Last Post
patrickkv2
IS - 3rd Gen (2014-present)
35
Jun 29, 2015 07:03 AM
